package com.esign;

import org.junit.Test;

import java.util.ArrayList;

/**
 * @author LiKun
 * @date 2021/8/6 17:55
 */
public class ForTest1 {
    @Test
    public void one() {
        ArrayList<String> strings = new ArrayList<>();
        strings.add(null);
        strings.add("");
        strings.add(null);
        strings.add(null);
        System.out.println(strings);
    }
}
